Well it seems the hard worker Dark_Alex is, he's released some information on 2.71 SE Revision C! And its coming next week if all goes as planned! Also planned for the next week release is Hen Revision D! Here are some details on 2.71 SE Revision C.

Things already planned and/or included in 2.71 SE Revision C:

• You can choose the speed at which the PSP runs in. [aka 333 MHz, or 29 MHz]
• The selection of plug-ins from the memory stick. [Seems like loading PRX files from your memory stick!]
• Removing certain securities from the 2.71, thus allowing to better create homebrew for the 2.71 kernel. There also is a possible emergence of a 2.71 IrShell!
• You can now load your legally backed up ISOs from USB! No more devhook for that! [Loaded by a plugin on the memory stick.]

• DAX support not included. [It takes too much kernel memory.]

• A fix regarding the Plain Module loading in ISOs and CSOs, which caused a problem in Socom 2.